Partial Derivatives and Total Differentials

A function having several variables may be differentiated with respect to one of the 

Thennodynamics commonly deals with continuous changes in multivariable systems. For this rea.son, total differentials are frequently used and it is essential to have a clear idea of their meaning. 

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Fig. 2,6. A plane tangent to a curved surface, illustrating the meaning of partial derivatives and total differentials.

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